This diagram from a 1967 documentation shows how to switch high voltage neon lamps with 5V TTL outputs. The circuit can be adapted to function as a shield.
This circuit was obtained from an ancient American documentation, but appears elsewhere in this...
Found in an Electronics World of 1968 this circuit can use any SCR and diodes depending on the...
This high power dimmer uses a unijunction transistor to trigger the triac. The triac is choosen...